EP1014878A4 - Modulare wirbelsäulenplatte - Google Patents

Modulare wirbelsäulenplatte

Info

Publication number
EP1014878A4
EP1014878A4 EP98920918A EP98920918A EP1014878A4 EP 1014878 A4 EP1014878 A4 EP 1014878A4 EP 98920918 A EP98920918 A EP 98920918A EP 98920918 A EP98920918 A EP 98920918A EP 1014878 A4 EP1014878 A4 EP 1014878A4
Authority
EP
European Patent Office
Prior art keywords
coupling element
shaft
cuff
stem
coupling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98920918A
Other languages
English (en)
French (fr)
Other versions
EP1014878A1 (de
EP1014878B1 (de
Inventor
Joseph P Errico
Thomas J Errico
James D Ralph
Steven Tatar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
K2 Medical LLC
Original Assignee
TechSys Medical LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TechSys Medical LLC filed Critical TechSys Medical LLC
Publication of EP1014878A1 publication Critical patent/EP1014878A1/de
Publication of EP1014878A4 publication Critical patent/EP1014878A4/de
Application granted granted Critical
Publication of EP1014878B1 publication Critical patent/EP1014878B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7041—Screws or hooks combined with longitudinal elements which do not contact vertebrae with single longitudinal rod offset laterally from single row of screws or hooks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7007—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/701—Longitudinal elements with a non-circular, e.g. rectangular, cross-section
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped

Definitions

  • This invention relates generally to a spinal plating system for use with modular polyaxial pedicle screws. More particularly, the present invention relates to a modular plating assembly which receives modular polyaxial screws, and which may thereby be attached to the posterior or anterior-lateral surfaces of the vertebral column to immobilize the same.
  • the bones and connective tissue of an adult human spinal column consists of more than 20 discrete bones coupled sequentially to one another by a tri-joint complex which consist of an anterior disc and the two posterior facet joints, the anterior discs of adjacent bones being cushioned by cartilage spacers referred to as intervertebral discs.
  • This structure houses and protects critical elements of the nervous system while also having innumerable peripheral nerves and circulatory bodies in close proximity.
  • the spine is a highly flexible structure, capable of a high degree of curvature and twist in nearly every direction.
  • the spinal plating system comprises an elongate track, consisting of a pair of rails, spaced apart in parallel, coupled at each end.
  • the rails slideably receive, thereabout, a multiplicity of compressible coupling elements.
  • Each compressible coupling element comprises a first through hole into which the parallel rails are inserted in a manner which permits the coupling element to slide along the axial length of the track prior to it being compressed.
  • a second through hole in the coupling element is provided so that it may receive the threaded shaft of a pedicle screw assembly such as are shown in U.S. Patents 5,735,851 and 5,725,528 mentioned above.
  • the coupling elements each comprise a pair of slots on the outer lateral edges (the edges adjacent to, and laterally containing, the rails of the track element when same is inserted into the coupling element).
  • the slots extend for more than half the axial length of the coupling element, and are directed in opposite directions. These slots permit the coupling element to deflect compressibly upon the application of a compressive force. This deflection causes the coupling element to rigidly lock to the rails.
  • the modular polyaxial screw comprises: a threaded shaft portion, which is inserted into the vertebral bone, the top of shaft portion including a bowl-shaped socket and a second threading; a stem portion having a threading for receiving a locking nut, the bottom of the stem portion being ball-shaped (a semi-spherical section); and a cylindrical locking cuff which is mounted about the ball-shaped bottom of the stem and threadably secured to the top of the shaft to secure the ball of the stem in the bowl-shaped socket of the shaft.
  • the stem Prior to complete tightening of the cuff, the stem is polyaxially coupled to the shaft. Tightening of the cuff causes the ball-shaped end of the stem to be compression locked in the bowl- shaped socket of the shaft.
  • a plurality of such polyaxial pedicle screws are implanted into the vertebral bone, and the stems are roughly positioned to receive the plating system and the cuffs are tightened, thereby locking the stems in place.
  • the appropriate number of compressible coupling elements are then slideably advanced onto the track element (the track element itself may be sized according to the requirements of the surgeon).
  • the coupling elements are aligned in accordance with the positions of the stems, and each of the the stems is then inserted through the second through hole of the corresponding compressible coupling element. It shall be understood that the rials and the openings in the coupling elements which comprise the second through holes are sufficiently contoured to receive stem portions which are not parallel to one another, and not perpendicular to the coupling element itself.
  • a top locking nut is then advanced along the threading of the stem until it contacts the top surface of the compressible coupling element. Continued downward force applied by the nut causes the slots of the coupling element to narrow, and the coupling element to deflect. This deflection causes the coupling element to lock to the rails of the track element, thus completely securing the assembly together.
  • Figures la-c are side views of a threaded shaft, a stem portion, and a cuff element, respectively, which may be utilized in conjunction with the present invention (portions of Figure la and all of Figure lc being in cross-section);
  • Figure 2 is a partial cross-sectioned side view of an assembled polyaxial pedicle comprising the elements illustrated in Figure la-c;
  • Figures 3a and 3b are top and side cross-section views, respectively, of a track element of the present invention, wherein the cross-section view of Figure 3b is taken along line A-A of Figure 3a;
  • Figure 4a is a top view of a compressible coupling element of the present invention
  • Figure 4b is a side cross-section view of the compressible coupling element illustrated in Figure 4a wherein said cross-section is taken along line B-B of Figure 4a
  • Figure 4c is a side view of the compressible coupling element illustrated in Figure 4a wherein the view is taken from point C;
  • Figure 5 is a side cross-section view of the initial position of the compressible coupling element illustrated in Figures 4a-c mounted about the track element illustrated in Figures 3a-b;
  • Figure 6 is a side cross-section view of a top locking nut which may be utilized with the present invention
  • Figure 7 is a partial cross-section side view of an embodiment of the present invention mounted to a fully assembled modular polyaxial locking screw comprised of the elements illustrated in Figures 1-6.
  • FIG. la a modular polyaxial pedicle screw which may be used in conjunction with the present invention is provided.
  • the shaft portion of this polyaxial screw is provided in Figure la, and includes a threaded bone screw portion 102, a hexagonal midportion 104 (which is provided so that the shaft portion may be driven into the bone by convention hexagonal screw driving means), and an upper socket portion 106.
  • the upper socket portion 106 includes a bowl-shaped upper end 108 and a threaded cylindrical exterior surface 110.
  • the stem portion 112 of this preferred modular polyaxial pedicle screw comprises an upper post portion 114, which is threaded, and a lower ball-shaped end 116 which has substantially the same radius of curvature as the bowl-shaped socket 108 of the shaft portion 102.
  • This correspondence of shape permits the stem 112 to polyaxially rotate relative to the shaft 102 when the ball-shaped end 116 is seated loosely in the bowl-shaped socket 108.
  • the cuff portion 122 of the preferred embodiment comprises a cylindrical element having a lower portion 124 which comprises an interior threading 126 which mates with the threaded upper exterior cylindrical surface 110 of the shaft portion.
  • the cuff 122 further includes an upper interior socket 128 in which the upper portion of the ball-shaped end 116 of the stem may 112 be held.
  • the upper portion 132 of the cuff 122 includes an opening 130 through which the post portion 114 of the stem may extend (and polyaxially angulate relative to the cuff and shaft).
  • the track element 150 itself simply comprises a pair of rails 152a, 152b which extend in a spaced apart relationship, parallel to one another for an axial length of the track.
  • the ends 154a, 154b of the track 150 comprise inwardly curved and continguous ends of the rails 152a, 152b such that the track maintains an elongated loop shape.
  • the cross- section of the rails 152a, 152b illustrated herein shows the curvate of the inwardly facing surfaces 156a, 156b of the rails. This inward curvature is preferred insofar as it permits greater flexibility of coupling with a post portion 114 of a pedicle screw as it allows a range of entrance angles of the post 114 between the rails (described more fully hereinbelow).
  • the element 200 comprises a hollow rectangular body, having a first through hole 202 which extends therethrough.
  • This first through hole 202 is designed to receive the axial length of the track element 150.
  • the lateral inner surfaces 204a,204b are contoured to cup around the outer surfaces of the rails 152a, 152b, respectively, such that the coupling element 200 may slide freely along the axial length of the track 150.
  • the coupling element includes a pair of slots 206a,206b formed in the lateral walls 204a,204b, respectively. The slots 206a,206b do extend for more than half, but less than fully through the axial length of the coupling element 200, and are diagonally opposing in their orientation (see Figure 4a).
  • FIG. 4a in which a top view of the compressible coupling element 200 is provided, the opposite sense of the incomplete slots 206a,206b is illustrated.
  • a second through hole 208 extending through the upper and lower surfaces of the coupling element, is provided to receive the post 114 portion of a pedicle screw of the type illustrated and described with respect to Figures la-c and 2.
  • the lips 210a,210b of the second through hole are tapered inwardly toward the hole in a manner which, like the taper of the inner surfaces 156a,156b of the rails, to permit easier coupling to non-perpendicularly received post portions 114.
  • the embodiment shown in Figure 4c is an alternative side view of the coupling element which illustrates the incomplete nature of the slots (slot 206b being shown).
  • the coupling element 200 is designed to be compressibly compactible insofar as the application of a downward force on the coupling element 200 causes the slots 206a,206b to deflect, therein narrowing. This narrowing, if forced when the coupling element 200 is mounted to the rail, as illustrated in Figure 5, causes the element to be compression locked to the rails 152a, 152b. Therefore, the application of a sufficient compression force onto the compressible coupling element 200 when it is mounted to the track element 150 permits the two to be fully locked together (eliminating the slideability of the coupling element 200 relative to the axial extent of the track 150).
  • top locking nut 220 which is provided to be threadably engaged onto the threading of the upper post portion of the the stem 114 of the pedicle screw is shown in a side cross-section view.
  • the inner portion of the nut has a threading 222, while the exterior surface 224 is curvately tapered to be received into the tapered second through hole 208 of the compressible coupling element 200 independent of the non-perpendicular entrance of the post portion 114 thereinto.
  • the top of the locking nut 220 may also include a hexagonal recess 226, or other such screw driving tool receiving orifice, so that it may be advanced onto the threaded post portion 114.
  • the compressible coupling element 200 is then advanced into position along the rails 152a, 152b of the track element 150.
  • the threaded post portion 114 of the stem of the pedicle screw is then advanced through the second through hole 208 of the coupling element, until the upper portion of the cuff 122 seats into the tapered lower lip 210b of the coupling element 200.
  • the top locking nut 220 is then threadably advanced onto the threaded post section 114 until the curvate bottom 224 of the nut seats in the upper opening of the second through hole 208, and against the upper lip 210a.
  • Continued advancement of the top locking nut 220 causes a compressive force to be applied to the compressible coupling element 200.
  • the applied load which build between the fixed cuff 122 and the top locking nut 220, causes the incomplete slots 206a,206b to narrow, thereby causing the coupling element to be compression locked to the rails 152a, 152b.
  • the advantage of having the coupling element 200 seat around the rails 152a, 152b is to prevent the rails from expanding outwardly under the resultant (or any unforeseen) spreading force, such as the force of the top locking nut itself.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Electromagnets (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Finger-Pressure Massage (AREA)
EP98920918A 1997-05-01 1998-04-30 Modulare wirbelsäulenplatte Expired - Lifetime EP1014878B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/846,473 US5800435A (en) 1996-10-09 1997-05-01 Modular spinal plate for use with modular polyaxial locking pedicle screws
US846473 1997-05-01
PCT/US1998/008707 WO1998048719A1 (en) 1997-05-01 1998-04-30 A modular spinal plate

Publications (3)

Publication Number Publication Date
EP1014878A1 EP1014878A1 (de) 2000-07-05
EP1014878A4 true EP1014878A4 (de) 2004-09-08
EP1014878B1 EP1014878B1 (de) 2006-05-24

Family

ID=25298048

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98920918A Expired - Lifetime EP1014878B1 (de) 1997-05-01 1998-04-30 Modulare wirbelsäulenplatte

Country Status (10)

Country Link
US (1) US5800435A (de)
EP (1) EP1014878B1 (de)
JP (2) JP3999279B2 (de)
KR (1) KR100544373B1 (de)
AT (1) ATE326909T1 (de)
AU (1) AU746961B2 (de)
CA (1) CA2287483C (de)
DE (1) DE69834648T2 (de)
ES (1) ES2268772T3 (de)
WO (1) WO1998048719A1 (de)

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Also Published As

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JP2001522289A (ja) 2001-11-13
KR20010020448A (ko) 2001-03-15
CA2287483A1 (en) 1998-11-05
AU746961B2 (en) 2002-05-09
DE69834648T2 (de) 2007-05-03
ATE326909T1 (de) 2006-06-15
WO1998048719A1 (en) 1998-11-05
US5800435A (en) 1998-09-01
EP1014878A1 (de) 2000-07-05
WO1998048719A9 (en) 1999-05-06
JP2007268295A (ja) 2007-10-18
EP1014878B1 (de) 2006-05-24
KR100544373B1 (ko) 2006-01-23
CA2287483C (en) 2007-01-16
AU7364698A (en) 1998-11-24
JP3999279B2 (ja) 2007-10-31
ES2268772T3 (es) 2007-03-16
DE69834648D1 (de) 2006-06-29

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